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Journal of Foshan University

Subluminal optical solitons in a V-type atomic system

Yaguang Zeng

Published Jan 1, 2009• 0 citations
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Abstract

In a lifetime-broadened V-type atomic medium with spontaneously generated coherence(SGC) and one weak probe field,the formation of optical solitons is studied.With proper parameters,dark solitons can be exhibited in this highly resonant medium.Meanwhile,the group velocity of the solitons is subluminal.

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The linear and nonlinear pulse propagations in lifetime-broadened three-state media with spontaneously generated coherence (SGC) are investigated theoretically. Three generic systems of V-, ΛΛΛ-, and ΞΞΞ-type level configurations are considered and compared. It is shown that in linear propagation regime the SGC in the V-type system can result in a significant change of dispersion and absorption and may be used to completely eliminate the absorption and largely reduce the group velocity of a probe field. However, the SGC has no effect on the dispersion and absorption of the ΛΛΛ- and ΞΞΞ-type systems. In nonlinear propagation regime, the SGC displays different influences on Kerr nonlinearity for different systems. Specifically, it can enhance the Kerr nonlinearity of the V-type system whereas weaken the Kerr nonlinearity of the ΛΛΛ-type system. Using the SGC, stable optical solitons with ultraslow propagating velocity and very low pump power can be produced in the V-type system by exploiting only one laser field in the system.